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<h1><img src="../../../../boost.png" align="middle" />Storage concept</h1>
<div class="toc" id="toc"></div>
<h2><a name="range"></a>Storage concept</h2>
<h4>Description</h4>
<p>Storage is a variable-size container whose elements are arranged in a strict linear order.
<p>Storage extends the STL Container concept with some STL Sequence-like functionality. The main difference with
the Sequence concept however is that the Storage concept does not require default-initialisation of its
elements.
<h4>Refinement of</h4>
<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>
and 
<a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</a>
<h4>Associated types</h4>
No additional types beyond those defined by 
<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>
<h4>Notation</h4>
<table summary="storage types">
<tr><td><tt>X</tt></td><td>A type that is model of Storage</td></tr>
<tr><td><tt>T</tt></td><td>The value_type of <tt>X</tt></td></tr>
<tr><td><tt>t</tt></td><td>An object of type <tt>T</tt></td></tr>
<tr><td><tt>n</tt></td><td>object of type convertible to <tt>X::size_type</tt></td></tr>
</table>
<h4>Definitions</h4>
<h4>Valid expressions</h4>
In addition to the expressions defined in 
<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>,
and 
<a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</a>
the following expressions must be valid:
<table border="1" summary="type requirements">
<TR><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></TR>
<TR>
<td>Size constructor</td>
<td><tt>X(n)</tt></td>
<td>T is <a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</a></td>
<td><tt>X</tt></td>
</TR>
<TR>
<td>Fill constructor</td>
<td><tt>X(n,t)</tt></td>
<td></td>
<td><tt>X</tt></td>
</TR>
<TR>
<TD>Range constructor</TD>
<TD><tt>X(i, j)</tt></TD>
<TD><tt>i</tt> and <tt>j</tt> are <A href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterators</A> whose value type is convertible to <tt>T</tt> </TD>
<TD><tt>X</tt> </TD>
</TR>
<TR>
<TD>Resize</TD>
<TD><tt>a.resize(n, t)</tt></TD>
<TD><tt>a</tt> is mutable</TD>
<TD><tt>void</tt></TD>
</TR>
<TR>
<TD>Resize</TD>
<TD><tt>a.resize(n)</tt></TD>
<TD><tt>a</tt> is mutable</TD>
<TD><tt>void</tt></TD>
</tr>
</table>
<h3>Expression semantics</h3>
<table border="1" summary="expresisons">
<tr><th>Name<th>Expression<th>Precondition<th>Semantics<th>Postcondition
<tr>
<td>Default-constructor</td>
<td><tt>X()</tt>
<td></td>
<td>Creates 0 elements. 
</td>
<td><tt>size()==0</tt></td>
</tr>
<tr>
<td>Size-constructor</td>
<td><tt>X(n)</tt>
<td><tt>n>=0</tt></td>
<td>Creates n elements. Elements are constructed without an initializer. That is
if T is a (possibly cv-qualified) non-POD class type (or array thereof), the object is default
initialized. Otherwise, the object created has indeterminate value. See the sentance
"If new initializer is omitted" in section 5.3.4 paragraph 15 of the ISO C++ standard.
</td>
<td><tt>size()==n</tt></td>
</tr>
<tr>
<td>Fill-constructor</td>
<td><tt>X(n,t)</tt>
<td><tt>n>=0</tt></td>
<td>Creates n initialised element with copies of <code>t</code></td>
<td><tt>size()==n</tt></td>
</tr>
<TR>
<TD>Range constructor</TD>
<TD><tt>X(i, j)</tt></TD>
<TD><tt>[i,j)</tt> is a valid range.</TD>
<TD>copies the range <tt>[i,j) to the storage</tt></TD>
<TD><tt>size()</tt> is equal to the distance from <tt>i</tt> to <tt>j</tt>.  Each element is a copy of the corresponding element in the range <tt>[i,j)</tt>.</TD>
</TR>
<TR>
<TD>Resize</TD>
<TD><tt>a.resize(n, t)</tt></TD>
<TD><tt>n &lt;= a.max_size()</tt></TD>
<td>Modified the container so that it has exactly <tt>n</tt> elements.<br />
The container may be reallocated if its size changes.
Existing element values are preserved, additional elements are copies of <code>t</code>.</td>
<TD><tt>a.size() == n</tt></TD>
</TR>
<TR>
<TD>Resize</TD>
<TD><tt>a.resize(n)</tt></TD>
<TD><tt>n &lt;= a.max_size()</tt></TD>
<TD>Modified the container so that it has exactly <tt>n</tt> elements.<br />
The container may be reallocated if its size changes. Element values are uninitialised. That is,
each element value may be a previously assigned value or default construced value for <code>T</code>.</TD>
<TD><tt>a.size() == n</tt></TD>
</tr>
</table>
<h4>Complexity guarantees</h4>
<h4>Invariants</h4>
<h4>Models</h4>
<ul>
<li><a href="unbounded_array.html">unbounded_array</a>
<li><a href="bounded_array.html">bounded_array</a>
</ul>
<h4>Notes</h4>
<hr />
<p>Copyright (&copy;) 2000-2002 Joerg Walter, Mathias Koch<br />
   Use, modification and distribution are subject to the
   Boost Software License, Version 1.0.
   (See accompanying file LICENSE_1_0.txt
   or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
      http://www.boost.org/LICENSE_1_0.txt
   </a>).
</p>

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